oss4 doesn't produce working /dev/mixer, doesn't play sound

I am on a Geode LX system with CS5536 audio chipset. Using 2.6.32 in Lucid, OSS4 worked great. With 2.6.35 in Maverick, the modules load, no errors are produced besides a warning that my feeble hardware is incapable of mixing multiple audio streams, but no OSS4 audio. I had the same error/warning in 2.6.32, but had working audio.

I just grabbed the latest mercurial sources from OpenSound.com, built the source, and have working Opensound again. I'll report the bug as an OSS4 deb package bug.

As per the forums, other people on other architectures are merrily using OSS4 on Maverick. I have thus deduced the issue to be CS5536 specific, in the 2.6.36 kernel. I don't know if it is Ubuntu-patch related or 2.6.35 mainline related.

lsmod | grep oss:

oss_usb 92545 0
oss_geode 8451 0
osscore 541033 2 oss_usb,oss_geode

dmesg | grep oss:

[ 21.199847] osscore: This processor architecture is not compatible with vmix (info=-1) - Not enabled.
[ 22.178693] usbcore: registered new interface driver oss_usb

ossinfo (the weird part):

Version info: OSS 4.2 (b 2003/201007311944) (0x00040100) GPL
Platform: Linux/i586 2.6.35-22-generic #34-Ubuntu SMP Sun Oct 10 09:24:00 UTC 2010 (kjsa)

Number of audio devices: 0
Number of audio engines: 0
Number of MIDI devices: 0
Number of mixer devices: 0

Device objects
 0: osscore0 OSS core services
 1: oss_usb0 USB audio core services

MIDI devices (/dev/midi*)

Mixer devices

Audio devices

Nodes

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image (not installed)
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.34-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i586
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices: Error: [Errno 2] No such file or directory
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info: Error: [Errno 2] No such file or directory
Card0.Amixer.values: Error: [Errno 2] No such file or directory
Date: Wed Oct 13 02:29:59 2010
HibernationDevice: RESUME=UUID=48cd0ecc-8997-445f-b159-877b31bffcb2
InstallationMedia: Lubuntu 10.04 "Lucid Lynx" - i386 (20100429)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 002: ID 0ace:1215 ZyDAS ZD1211B 802.11g
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: KOHJINSHA Co.,Ltd SA Series
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=fc2889c3-f237-4387-979c-28dc9ce65db3 ro
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
dmi.bios.date: Built: 11/18/2006
dmi.bios.vendor: Insyde Software
dmi.bios.version: S18_V0.5_EC0.8
dmi.board.name: SA Series
dmi.board.vendor: KOHJINSHA Co.,Ltd
dmi.board.version: Rev 1.00
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 13
dmi.chassis.vendor: KOHJINSHA Co.,Ltd
dmi.chassis.version: Rev 1.00
dmi.modalias: dmi:bvnInsydeSoftware:bvrS18_V0.5_EC0.8:bdBuilt11/18/2006:svnKOHJINSHACo.,Ltd:pnSASeries:pvrRev1.00:rvnKOHJINSHACo.,Ltd:rnSASeries:rvrRev1.00:cvnKOHJINSHACo.,Ltd:ct13:cvrRev1.00:
dmi.product.name: SA Series
dmi.product.version: Rev 1.00
dmi.sys.vendor: KOHJINSHA Co.,Ltd